% 文档类
\documentclass{ctexart}
% 导言区

% 正文区
\begin{document}
	
 	\centering
	Centered text using a	
	\verb|\centering| macro.	

 	\raggedright
	Left-aligned text using a	
	\verb|\raggedright| macro.	

 	\raggedleft
	Right-aligned text using a	
	\verb|\raggedleft| macro.	
	
\end{document}